[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 13.267151] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 17.721921] random: sshd: uninitialized urandom read (32 bytes read) [ 17.995163] random: sshd: uninitialized urandom read (32 bytes read) [ 18.427187] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.0' (ECDSA) to the list of known hosts. [ 24.243787] urandom_read: 1 callbacks suppressed [ 24.243791] random: sshd: uninitialized urandom read (32 bytes read) executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 24.379853] ------------[ cut here ]------------ [ 24.384673] WARNING: CPU: 1 PID: 1981 at fs/direct-io.c:293 dio_complete+0x578/0x800 [ 24.392531] Kernel panic - not syncing: panic_on_warn set ... [ 24.392531] [ 24.399875] CPU: 1 PID: 1981 Comm: syz-executor317 Not tainted 4.14.67+ #1 [ 24.407002] Call Trace: [ 24.409583] dump_stack+0xb9/0x11b [ 24.413132] ? dio_complete+0x4c0/0x800 [ 24.417099] panic+0x1bf/0x3a4 [ 24.420282] ? add_taint.cold.4+0x16/0x16 [ 24.424423] ? __probe_kernel_read+0x163/0x1c0 [ 24.429000] ? dio_complete+0x578/0x800 [ 24.432972] __warn.cold.7+0x148/0x185 [ 24.436850] ? dio_complete+0x578/0x800 [ 24.440805] report_bug+0x1f7/0x26c [ 24.444422] do_error_trap+0x1ba/0x2c0 [ 24.448308] ? math_error+0x2d0/0x2d0 [ 24.452089] ? clear_shadow_entry+0x190/0x190 [ 24.456671] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 24.461501] invalid_op+0x18/0x40 [ 24.464936] RIP: 0010:dio_complete+0x578/0x800 [ 24.469492] RSP: 0018:ffff8801c07ef070 EFLAGS: 00010297 [ 24.474839] RAX: ffff8801c0012f00 RBX: ffff8801c65949c0 RCX: 0000000000000000 [ 24.482087] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8801c0012f24 [ 24.489336] RBP: 0000000000010000 R08: 0000000000000001 R09: 0000000000000000 [ 24.496586] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801c5c6d4d8 [ 24.503838] R13: 0000000000010000 R14: 0000000000000002 R15: ffff8801c6594a58 [ 24.511115] ? ext4_update_bh_state+0xe0/0xe0 [ 24.515592] __blockdev_direct_IO+0x7614/0xc4e0 [ 24.520257] ? sb_init_dio_done_wq+0x70/0x70 [ 24.524649] ? release_pages+0x6e3/0xa90 [ 24.528698] ? _raw_spin_unlock_irqrestore+0x54/0x70 [ 24.533785] ? ext4_dio_get_block_unwritten_async+0x1b0/0x1b0 [ 24.539662] ? ext4_dio_get_block_unwritten_async+0x1b0/0x1b0 [ 24.545524] ext4_direct_IO+0x905/0x27f0 [ 24.549587] ? __filemap_fdatawait_range+0x1c2/0x260 [ 24.554677] ? ext4_da_write_begin+0x1050/0x1050 [ 24.559412] ? wait_on_page_bit+0x2e0/0x2e0 [ 24.563711] ? current_time+0x16/0xb0 [ 24.567502] ? replace_page_cache_page+0x5f0/0x5f0 [ 24.572413] ? current_time+0x89/0xb0 [ 24.576199] ? filemap_check_errors+0x8b/0xb0 [ 24.580702] generic_file_direct_write+0x225/0x430 [ 24.585668] __generic_file_write_iter+0x213/0x540 [ 24.590586] ? generic_write_checks+0x252/0x410 [ 24.595242] ext4_file_write_iter+0x4f6/0xe20 [ 24.599723] ? ext4_file_mmap+0x1a0/0x1a0 [ 24.603859] ? kasan_kmalloc.part.1+0xa9/0xd0 [ 24.608339] ? kasan_kmalloc.part.1+0x4f/0xd0 [ 24.612820] ? __kmalloc+0x153/0x340 [ 24.616589] ? iter_file_splice_write+0x142/0xab0 [ 24.621417] ? direct_splice_actor+0x116/0x160 [ 24.625975] ? splice_direct_to_actor+0x28c/0x750 [ 24.630795] ? do_splice_direct+0x17b/0x220 [ 24.635171] do_iter_readv_writev+0x3a4/0x560 [ 24.639703] ? clone_verify_area+0x1e0/0x1e0 [ 24.644102] ? security_file_permission+0x88/0x1e0 [ 24.649014] do_iter_write+0x156/0x530 [ 24.652884] ? kasan_unpoison_shadow+0x30/0x40 [ 24.657449] ? kasan_kmalloc+0x76/0xc0 [ 24.661318] vfs_iter_write+0x70/0xa0 [ 24.665101] iter_file_splice_write+0x5b4/0xab0 [ 24.669757] ? vmsplice_to_user+0x1e0/0x1e0 [ 24.674061] ? avc_policy_seqno+0x5/0x10 [ 24.678105] ? vmsplice_to_user+0x1e0/0x1e0 [ 24.682412] direct_splice_actor+0x116/0x160 [ 24.686807] splice_direct_to_actor+0x28c/0x750 [ 24.691458] ? pipe_to_sendpage+0x300/0x300 [ 24.695765] ? do_splice_to+0x150/0x150 [ 24.699718] ? security_file_permission+0x88/0x1e0 [ 24.704634] do_splice_direct+0x17b/0x220 [ 24.708763] ? splice_direct_to_actor+0x750/0x750 [ 24.713588] ? rcu_read_lock_sched_held+0x102/0x120 [ 24.718657] do_sendfile+0x4a1/0xb50 [ 24.722362] ? do_compat_pwritev64+0x170/0x170 [ 24.726927] ? __might_fault+0xd4/0x1b0 [ 24.730890] ? __might_fault+0x177/0x1b0 [ 24.734936] SyS_sendfile64+0xab/0x140 [ 24.738806] ? SyS_sendfile+0x150/0x150 [ 24.742763] ? do_syscall_64+0x43/0x4b0 [ 24.746720] ? SyS_sendfile+0x150/0x150 [ 24.750686] do_syscall_64+0x19b/0x4b0 [ 24.754568] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 24.759744] RIP: 0033:0x4465a9 [ 24.762916] RSP: 002b:00007f5020474d18 EFLAGS: 00000297 ORIG_RAX: 0000000000000028 [ 24.770602] RAX: ffffffffffffffda RBX: 00000000006dbc48 RCX: 00000000004465a9 [ 24.777855] RDX: 0000000020d83ff8 RSI: 0000000000000006 RDI: 0000000000000004 [ 24.785127] RBP: 00000000006dbc40 R08: 65732f636f72702f R09: 65732f636f72702f [ 24.792377] R10: 00008000fffffffe R11: 0000000000000297 R12: 00000000006dbc4c [ 24.799626] R13: 00007f5020474d20 R14: 0000000000000000 R15: 0000000000000000 [ 24.807248] Dumping ftrace buffer: [ 24.810847] (ftrace buffer empty) [ 24.814547] Kernel Offset: 0xf400000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff) [ 24.825363] Rebooting in 86400 seconds..